Slobodan Kovacevic, Developer in Novi Sad, Vojvodina, Serbia
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Slobodan Kovacevic

Verified Expert  in Engineering

Software Developer

Novi Sad, Vojvodina, Serbia
Toptal Member Since
January 15, 2014

Slobodan is a senior web developer and programmer with over a decade of experience working on the web. He is passionate about Ruby and Ruby on Rails. He can work in different roles, ranging from an individual developer to tech lead and project manager.


Amazon Web Services (AWS), PostgreSQL, Heroku, Amazon S3 (AWS S3)...
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Amazon Web Services (AWS), Heroku, Amazon S3 (AWS S3), Ruby on Rails (RoR), Ruby GmbH
Ruby on Rails (RoR), Ruby




Preferred Environment

Vi, Git, MacOS

The most amazing...

...thing I've done is refactor an existing app achieving 10x speed-up.

Work Experience

Director of Engineering

2017 - PRESENT
  • Grew a team of Ruby developers.
  • Mentored new developers.
  • Provided tech guidance.
  • Managed different projects.
Technologies: Amazon Web Services (AWS), PostgreSQL, Heroku, Amazon S3 (AWS S3), Ruby on Rails (RoR), Ruby

Lead Developer and Project Manager

2014 - 2017
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  • Built a team of five developers.
  • Mentored junior Ruby developers.
Technologies: Amazon Web Services (AWS), Heroku, Amazon S3 (AWS S3), Ruby on Rails (RoR), Ruby

Ruby Developer

2012 - 2014 GmbH
  • Created a JSON service-based architecture for running multiple sites.
  • Refactored most of the existing code.
  • Created a Rails engine with common functionality shared by multiple sites.
  • Streamlined the deployment process.
  • Implemented performance improvements on and
Technologies: Ruby on Rails (RoR), Ruby

Senior Ruby/Rails Engineer

2011 - 2014
Reciprocity, Inc.
  • Optimized and further developed the Reciprocity gamification app.
  • Worked on a Google sponsored GRC open source project.
  • Implemented a new Refinery-based CMS for
  • Maintained
  • Worked from Google in Mountain View and SF.
Technologies: Amazon Web Services (AWS), Heroku, Amazon S3 (AWS S3), Ruby on Rails (RoR), Ruby

Freelance Ruby/Rails Web Developer

2008 - 2011
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  • Freelanced on many different projects.
  • Worked on,,, and
Technologies: Amazon Web Services (AWS), Amazon S3 (AWS S3), Heroku, Ruby on Rails (RoR), Ruby

CEO, Lead Developer, Co-founder

2001 - 2008
Array Studio
  • Led a team of developers and designers.
  • Handled project management tasks.
Technologies: PHP, Ruby on Rails (RoR), Ruby

Custom-built a CMS with shared functionality and API service for directory style listings for yoga centers. The API service is designed to run multiple content sites through it using a RESTful JSON interface.

Custom-built CMS for directory style listings for ayurveda centers. Uses API service built for which is designed to run multiple content sites through it using a RESTful JSON interface.

A custom CMS built for allowing the client to change certain parts of public-facing site. I performed maintenance tasks and added new sections.
Custom CMS built on top of Refinery CMS platform. It also has custom Refinery extensions for shopping cart, payment processing through PayPal (PayPal express and PayPal advanced payments [on-site]) and several third-party service integrations (such as Oracle's Eloqua).
An artist community and online gallery space. It enables artists to create their online galleries, choose between different templates, upload artwork, comment on artwork, and interact with other artists and visitors.
An online shop for fishing equipment. Custom-built from the ground up with product catalog, integration with warehouse software (for stock levels), customer registration system, and different payment methods (online through local card processing bank and offline transfers).


Devise, PayPal API, jQuery, Amazon API, Twitter API, jQuery UI


Jekyll, Git, GitHub Pages, GitHub, AWS IAM, Amazon Simple Email Service (SES), Amazon CloudFront CDN, Vim Text Editor, MacVim


Ruby on Rails (RoR), Bootstrap, Ember.js


Ruby, Sass, Haml, SQL, CSS, HTML, JavaScript, PHP, Go


Object-oriented Programming (OOP), Model View Controller (MVC), Agile Software Development, Continuous Integration (CI), Test-driven Development (TDD)


MacOS, Heroku, Amazon EC2, Amazon Web Services (AWS), Ubuntu, Linux


MySQL, Amazon S3 (AWS S3), SQLite, PostgreSQL, Redis, MongoDB, Memcached, NoSQL


PayPal, Machine Learning, Vi

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